[PATCH v2 1/3] arm/arm64: KVM: Allow handle_hva_to_gpa to return a value

[Marc Zyngier]

So far, handle_hva_to_gpa was never required to return a value.
As we prepare to age pages at Stage-2, we need to be able to
return a value from the iterator (kvm_test_age_hva).

Adapt the code to handle this situation. No semantic change.

Acked-by: Christoffer Dall <christoffer.d...@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
---
 arch/arm/kvm/mmu.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 3e6859b..ffa06e0 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -1377,15 +1377,16 @@ out_unlock:
        return ret;
 }
 
-static void handle_hva_to_gpa(struct kvm *kvm,
-                             unsigned long start,
-                             unsigned long end,
-                             void (*handler)(struct kvm *kvm,
-                                             gpa_t gpa, void *data),
-                             void *data)
+static int handle_hva_to_gpa(struct kvm *kvm,
+                            unsigned long start,
+                            unsigned long end,
+                            int (*handler)(struct kvm *kvm,
+                                           gpa_t gpa, void *data),
+                            void *data)
 {
        struct kvm_memslots *slots;
        struct kvm_memory_slot *memslot;
+       int ret = 0;
 
        slots = kvm_memslots(kvm);
 
@@ -1409,14 +1410,17 @@ static void handle_hva_to_gpa(struct kvm *kvm,
 
                for (; gfn < gfn_end; ++gfn) {
                        gpa_t gpa = gfn << PAGE_SHIFT;
-                       handler(kvm, gpa, data);
+                       ret |= handler(kvm, gpa, data);
                }
        }
+
+       return ret;
 }
 
-static void kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, void *data)
+static int kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, void *data)
 {
        unmap_stage2_range(kvm, gpa, PAGE_SIZE);
+       return 0;
 }
 
 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
@@ -1442,7 +1446,7 @@ int kvm_unmap_hva_range(struct kvm *kvm,
        return 0;
 }
 
-static void kvm_set_spte_handler(struct kvm *kvm, gpa_t gpa, void *data)
+static int kvm_set_spte_handler(struct kvm *kvm, gpa_t gpa, void *data)
 {
        pte_t *pte = (pte_t *)data;
 
@@ -1454,6 +1458,7 @@ static void kvm_set_spte_handler(struct kvm *kvm, gpa_t 
gpa, void *data)
         * through this calling path.
         */
        stage2_set_pte(kvm, NULL, gpa, pte, 0);
+       return 0;
 }
 
 
-- 
2.1.4

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